This vending machine blog could very well be the most single-minded thing I've ever seen on the Internet, and I love it for that.
What's even more wonderful about the vending machine blog is its title, which loosely translated from Japanese is "I take a picture of the vending machine every day (or so). I’m very sorry," according to Kotaku.com. At least the vending machine blog focuses on a machine that has a window that changes up what is stocked in the machine every day in a visual way. If it was one of the North American style machines that don't allow the customer to see inside the machine, the blog would get really repetitive, really fast.
If you don't speak Japanese, the vending machine blog by a man who goes by the name Motomachi can be viewed on a Flickr account. Just don't expect to see a Pepsi machine in the images.